Bicycle.



No. 628,843. Patented. July ll, I889. M. PEDERSEN.

BICYCLE.

(Application filed June 27, 1898.)

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jfi iww No. 628,843. Patented July-ll, I899.

M. PEDEBSEN.

BICYCLE.

(Application filed June 27, 189.)

(No Model.)

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MIKAEL PEDERSEN, OF DURSLEY, ENGLAND.

BICYCLE.

, SPECIFICATION forming part of Letters Patent No. 628,843, dated July11, 1899.

7 Application filed June 27, 1898. Serial No. 684,601. (N0 model.)

To (all who/1t it III/!] concern:

Be it known that I, MIKAEL PEDERSEN, a subject of the King of Denmarkresiding at Dursley, England, have invented new and useful Improvementsin Bicycles, (for which I have applied for a patentin Great Britain, No.28,485, dated December 2, 1897,) of which the following is aspecification.

My invention relates to tandem, triplet, quadruplet, and other bicyclesintended for two or more riders, the object of my invention being toconstruct a frame which is light and strong.

A frame constructed according to my invention may be regarded as beingcomposed of a series of triangles which are arranged in the novel mannerhereinafter described, so as to mutually support and strengthen oneanother.

In the accompanying drawings, Figure 1 is a side elevation of a tandembicycle provided with my improved frame, and Fig. 2 is a perspectiveview of the frame. Fig. 3 is a side elevation of a triplet bicycle, andFig. 4 is a diagram illustrating the principle of construction of myframe. Figs. 5 and 6 are respectively an elevation and a sectionalplan,drawn to a larger scale, illustrating a detail of the construction.

Referring first to Fig. 4, a Z) 0,611) c, d c e,fc e, fe g, h e g, and hg 11 indicate a series of triangles such as are used in the constructionof a bicycle-frame. The bars forming the bases of the several trianglesare united to suitable sockets for carrying the crank-axle bearings, thesaid base-bars and sockets when united practically forming a continuousbar. The sections of this bar between the pairs of bearings each formthe common base of two triangles with the exception of the rear section9 i-that is to say, the section b c has upon it the triangles a b c, d bc; the section c c, the triangles d c e, f c e; the section e g, thetrianglesf e g, h e g, and the section g i the triangle h g 1 It will benoticed that all the triangles, with the exception of the front triangleCt 19 c, are arranged so that two triangles on adjacent sections have acommon bar--that is to say, the triangles cl 1) 0, (Z c e on thesections 1) c, c e have the common bar d c, the triangles f c e, f e gon the sections 0 6,6 9 have the common barf e, and the triangles 7t 6g, h g i on the sections e g, g 2' have the common bar h g. All the barsare composed of double tubes united to suitable sockets and also unitedat any points where the tubes cross or intersect one another.

The bicycle shown in Figs. 1 and 2 being only a tandem" is composed ofonly three triangles. The front-wheel forkj is at its up per end pivotedor jointed in a socket at the apex a of the front triangle and at apoint between its two ends to a pair of bars l, projecting from thefront socket at the angle 1) of the front triangle. is carried at theangle e of the rear triangle cl 0 e. The seat forthe front rider issuspended between the apices a and d and for the rear rider between theapex (Z and the extremity 'of an additional pair of bars or backstay m,

which project or projects from sockets of the angle c,'the said barsbeing connected by a tension-brace n to the extremity e of the reartriangle.

In the case of the triplet bicycle shown in Fig. 3 the frame is composedof five triad gles, the front-wheel fork and the rear-seat backstaybeing attached in the manner hereinbefore described.

It will be understood that in the case of a quadruplet the frame will becomposed of seven triangles, in the case of a quintet bicycle of ninetriangles, and so on.

It may be advantageous in some cases to strengthen the front forkagainst the lateral displacement which might be produced when severalriders are running at a high speed. In this case I advantageously trussthe front fork in a manner which will be clearly understood by referenceto Figs. 5 and 6. In these figures, 0 0 0 0 are the four tubes of whichthe front fork is usually composed, and .p is the plate which braces thesaid tubes together and to which the pair of bars Z is pivoted at g. Inorder to strengthen the fork, I provide the plate 13 with the projectingpieces 1" r, through which the truss wires or rods .5- s, secured to theupper or lower ends of the fork, are passed in a manner which will bereadily understood by reference to the drawings.

\Vhen additional strength is required, I sometimes arrange tie-bars it,as shown in Fig. 3, between the apex of the front trian- The axle forthe rear wheel gle and the back-wheel axle and between the rear end ofthe back-seat stay and the front crank-axle socket.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- 1. A bicycle-frame built up of a series of barsarranged in the form of triangles, the bases of which triangles form acontinuous horizontal bar, the sections of said bar forward of the rearsection each forming the common base of two triangles, each triangle inrear of the front triangle on the front section, having one of its sidescommon to two triangles of adjacent sections, crank-axle hearingslocated on said continuous bar, a front stay extending from theforward-crankaxle bearing, a back stay extending from the rear-axlebearing, the rear-triangle base beingformedin a fork to receive the rearwheel, and a tension-brace for the rearstay, substantially as described.

2. A bicycle-frame built up of a series of bars arranged in the form oftriangles, the bases of which triangles form a continuous horizontalbar, the rear-triangle base being formed in a fork to receive the rearwheel, the sections of said bar, forward of the rear section, eachforming the common base of two triangles, each trianglein rear of thefront triangle on the forward section, having one of its sides common totwo triangles on adjacent sections, crank-axle hearings on saidcontinuous bar, a device on the apex of the front triangle to pivotallyengage the front fork, a front stay extending forward from the saidcontinuous bar, provided with means for pivotally engaging the frontfork, a back stay, a

brace for the back stay, the apices of said triangles and said rear staybeing provided with devices for supporting saddles, and a-diagonaltie-bar extending from each end of the continuous horizontal bar to theupper portion of the frame at the opposite end of the same,substantially as described.

3. A bicycle-frame built up of a series of bars forming triangles, thebases of said triangles forming a continuous bar, the reartriangle baseof which forms a fork for the rear wheel, the crank-axle bearings at theends of said triangle-bases, each section of the said bar forward of therear section forming the common base of two triangles, each triangle inrear of the front triangle of the forward section having one of itssides common to two triangles on adjacent sections, the bars forming thesides of the triangles being composed of double tubes united by suitablesocket-s, the apex of the front triangle being provided with means forpivotally engaging the front fork, a front stay extending forward fromthe front-triangle base and provided with means for pivotally engagingthe front fork, a back stay extending from the rear-axle bearing, atension-brace for the back stay, the apices of the triangles and saidback stay being provided with devices for supporting saddles, a diagonaltie-bar extending from the forward crank-hanger to the upper end of theback stay, and a similar tie-bar extending from the rear end of thehorizontal bar to the apex of the forward triangle, substantially asdescribed.

MIKAEL PEDERSEN.

Witnesses:

G. F. REDFERN, JOHN E. BOUSFIELD.

